Carburetor



Nov. 22, 1955 w. E. ARMSTRONG 2,724,584

CARBURETOR Filed Dec. 14, 1950 s Sheets-Sheet i INVENTO'R. WERNER E.ARMSTRONG ATT/PNEX Nov. 22, 1955 w. E. ARMSTRONG 2,724,584

CARBURETOR Filed Dec. 14, 1950 I5 Sheets-Sheet 3 INVENTOR. WERNER E.ARMSTRONG Wi -W shown in Figure 1. a

2,724,584 CARBURETOR Werner E. Armstrong, Milwaukee, Wis., assignor, by

mesne asslgnments, to Fairbanks, Morse & Co., Chicago, 111., acorporation of Illinois Application December 14, 1950, Serial No.200,827

2 Claims. Cl. 261-69) vertical plane exclusively in the use of the tool.

Still another object of my invention is to provide a carburetor thatmaybe installed into a conventional fuel supply line leading to aconventional manifold of an internal combustion engine. l

A further object of my invention is to provide a device of the characterdescribed that may be provided with various types of mountings to fitparticular installations designedfor its adoption on various engines.

It is manifest to anyone familiar with the art that power tools such ashand saws or the like which are operated by an internal combustionengine are quite frequently employed in a manner that necessitates theirbeing inverted or inclined angularly to one or the other side, and it isimperative that the supply of fuel be constant inany position.

With the device as describedand claimed herein, the fuel supply will atall times be governed and regulated, yet provide quick response to thethrottle adjustment.

The device is exceedingly simple in construction, economical tomanufacture, yet highly etficient for the purpose for whichit isintended.

Other and further objects of my invention will become more apparent asthe description proceeds when taken in conjunction with the drawings inwhich:

3 Figure 1 is a side elevation of the assembled carburetor. 1 1

Figure 2 is a top view of the assembled carburetor as Figure 3 is afragmentally, laterally disposed crossitcdStates Patent sectional viewof the assembled carburetor, taken at the line 33 in Figure 2.

Figure 4 is a longitudinal fragmentary cross-sectional view of thedevice taken at the line 4-4 in Figure 2, and Figure 5 is a view asshown in Figure 3 enlarged to provide for clearer detail of thecomponent parts constituting the device.

Similar characters of reference indicate corresponding parts throughoutthe several views, and referring now to the same, the character 10 showsa longitudinal cylindrical body of the device forming an air passagewhich is provided ateach of its ends with flanges shown as 11 I e and12. The flange 11 acts as a support for an air cleaner (not shown),while the flange 12 acts as a mounting to support the entire device ontothe air intake manifold which is shown in fragmentary section andindicated by the character 13. In Figures 3 and 4, I show a lateral andlongitudinal cross-section respectively. The fuel inlet 14 engages thelower portion of a housing or enclosure 15 having a cap 15', and theinlet 14 is supported by 2,724,584 Patented Nov. 22, 1955 means of athreaded portion at 16 as shown in Figure 3 and is provided with a port17 having a seat 18 and terminating into a larger tubular portion 19,which guides the ball 20, which ball contacts the seat 18 and has a pin21 disposed on its top surface.

The cap 15' is shown attached to the housing or enclosure 15 bymeans ofa plurality of screws 22. However, this may be attached in any efficientmanner, and a pliable diaphragm 23 is disposed between the body 15 ofthe enclosure and the cap 15'. There are a pair of circular rigid discsof sheet material shown as 24 and 24' adjacent the opposite sides of thediaphragm 23. The diaphragm 23 is provided with an aperture through itscenter, and the discs 24 and 24' are attached to a longitudinalcentrally disposed pin 25, extending through a centrally disposedaperture within the diaphragm.

The discs 24 and 24' are shown arcuated outwardly at their outerperipheral, edges 26, to prevent the edges of the discs from cuttinginto the pliable diaphragm during its actuation.

A lever 27 is pivotally inserted at 28 into the inner face 29 of theenclosure 15. This lever is forked at its upper end 30, and engages acollar 31 forming a part of the pin 25, and a conical resilient memberor spring 32 is disposed between this collar 31 and the inner face 29 ofthe enclosure 15. The lower right angle portion of the lever 27, restson the top of the pin 21 which contacts the upper face of the valve ball20 and keeps the ball 20 in engagement with the seat 18 in the port 17which acts as a valve for the fuel inlet.

There is a counter-balance weight 33 attached to the top of a pivotedarm 34, which arm is hingedly mounted at 35 to a bracket 36 attached tothe inner face 37, of the cap 15', by means of screws 38 or in any othereflicient manner. This arm 34 has a pin 39 attached thereto andextending at right angle therefrom atits lower end, and the outwardlyextending end of the pin 39 engages thecenter of the diaphragm disc 24'.

Extending outward through the wall of the diaphragm enclosure 15 and inalignment with the pin 25 is an outlet port 40 which enters a fuelpassage 41 which extends longitudinally within the member 42 which isattached to the body 10 of the carburetor tube, and a valve stem 43having a conical point 44 engaging the outer periphcry of the port 40,threadedly engages the member 42 and is shown with a slotted head 45 foradjusting the point 44 on the stem 43. The stem 43 is held secure andkept from revolving by means of the resilient member 46 disposed betweenthe head 45 and the member 42, thus forming a main fuel adjusting valve.

The longitudinal tubular fuel passage 41 has a tubular There is shown achoke valve 54, mounted on a shaft 55, which is journaled within theenclosure 48 and actuated by means of the lever 56, and a throttle valve57,

disposed within the enclosure 48, is mounted on the shaft 58 which isactuated by the lever 59 and the adjustment of the lever is limited byits engagement with the stop screw 60.

The operation of the device is extremely simple and positive. Obviously,the purpose of the carburetor is to provide a constant and correct fuelsupply no matter what angle the tool actuated by the internal combustionengine is held. The carburetor forming a part of the engine willfunction equally eflicient whether the engine is turned over onto eitherside, or inverted. The stabilizing counterbalance will at all timesperform its function. It is manifest to anyone, familiar with the artthat the engine during its operation will create'a vacuum in thecompartment 15 causing the diaphragm 23 to flex inwardly against thepressure of the resilient member 32 and by so doing will permit air toenter the'compartment formed by the cap 15' through the vent 61, and asthe resilient member 32 is compressed, the lever 27 will move toward theoutlet port 40 at its upper end causing the pin 21 to rise, therebypermitting the ball 20 to be free on the seat 18 permitting fuel toenter through the inlet 17. However, when the device is turned to aposition as shown in Figure 2, and the cap 15 is at the bottom, theweight 33 will cause the lever 34 to pivot at. 35 forcingtthe pin 39upwardly to stabilize the Weight of the diaphragm, spring, fuel and allparts resting on upper. part of the diaphragm, and will balance theaction of the diaphragm against the pressure of the spring 32 permittingthe vacuum caused by the engine to draw the fuel in a normal manner.This would not be possible without the stabilized counterbalancedfeature provided by the Weight 33. The control of the fuel supplythrough the port 40 is accomplished by the manual adjustment of thescrew 43, and as the fuel supply enters the port 40, it will flowthrough the main fuel supply passage in the member 42 and will passthrough the port 47 where it will mix with the air and where it iscontrolled by means of the throttle vane 57 on the shaft 58 actuated bythe throttle lever 59.

' The purpose of the entire construction is to definitely stabilize themovement of the diaphragm 23 between the resilient member 32 and thelever 34 which is weighted with the balance weight. In that way, thecontrol of the amount of fuel entering through the port 17 is governedand the exact amount of fuel can be further governed by means of thevalve 44 in the supply line.

In the specific construction shown, there are many features notheretofore anticipated by the art, and although I have shown aparticular arrangement of the component parts constituting the device, Iam fully cognizant of the fact. that many changes in the form andconfiguration of the component parts may be made without affecting theefficiency or operativeness of the device, and without departing fromthe spirit of my invention or the scope of the appended claims.

Having thus described my invention, what I claim and desire to secure byLetters Patent in the United States is:

1. In a carburetor, the combination comprising a throat member having anair passage therethrough, a housing providing a fuel regulating chamberadjacent said throat member, a fuel-discharge assage extending from saidchamber to a fuel jet opening into said throat, flow restrictingmetering means disposed in said discharge passage, said regulatingchamber having an open side communicating with the atmosphere, a pliablediaphragm movable between inner andiouter positions closing said openside of said chamber, spring means cooperatively enin the port passage,to admit fuel through the tubular.

passage to said chamber, a valve controlling lever having a first partoperatively connected to said spring means and diaphragm, and a secondpart extending at substan tially a right-angle to the said first part,said second part of the lever overlying the opening of said tubularpassage to the chamber and having its end engaging a wall portion ofsaid housing in pivotal support of the lever thereon, said leverpivoting in response to movements of said diaphragm such that saidsecond part thereof is displaced toward and away from said tubularpassage correspondingly to diaphragm movements toward and away from itssaid outer position, and a pin extending in said tubular passage betweensaid second part of the lever and said ball valve effective in thepivoted position of the lever corresponding to the outer position of thediaphragm, to dispose and retain the ball valve on said valve seat, saidlever upon diaphragm'movement in the direction of its said innerposition, pivoting to raise said pin from the ball valve and therebyreleasethe latter for fuel pressure response to open said port passageand admit fuel to said chamber.

2. In a carburetor, the combination in accordance with claim 1, whereina pivoted counterweight lever is disposed substantially parallel to saiddiaphragm, said counterweight lever is disposed substantially parallelto said diaphragm, said counterweight lever having a mid fulcrum, aweighted free end, and an operating endiconnected to said diaphragm.

References Cited in the file of this patent UNITED STATES PATENTS1,933,379 Mock Oct. 31, 1933 2,067,221 Winter et a1. Ian. 12, 19372,068,938 Viel Q. Jan. 26, 1937 2,084,377 Barbarou June 22, 19372,141,365 Schuttler Dec. 27, 1938 2,220,229 Grove Nov. 5, 1940 2,348,388Jenkins May 9,1944

